can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()

{
  "id": "3bf20016b51523b812396abeb0074c922568003808d15ee1fe6ad3dcf9544e7d",
  "url": "https://osv.dev/vulnerability/CVE-2026-72117",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler() For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices. op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms. Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison. As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them.",
    "evidence": "osv:CVE-2026-72117",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-72117",
      "aliases": [
        "CVE-2026-72117"
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "fixed": "c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5"
                },
                {
                  "fixed": "4b97410f4bba18d2ee2784c8e089104f387bc27c"
                },
                {
                  "fixed": "5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c"
                },
                {
                  "fixed": "656ff69ef235699035e57d9e1ae417e62a38aa7f"
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                {
                  "fixed": "136de17f38630307991c59aa7080012a99451783"
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              "type": "ECOSYSTEM",
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                  "introduced": "2.6.25"
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                  "fixed": "5.10.265"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:46.187603147Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/136de17f38630307991c59aa7080012a99451783",
        "https://git.kernel.org/stable/c/4b97410f4bba18d2ee2784c8e089104f387bc27c",
        "https://git.kernel.org/stable/c/58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8",
        "https://git.kernel.org/stable/c/5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c",
        "https://git.kernel.org/stable/c/656ff69ef235699035e57d9e1ae417e62a38aa7f",
        "https://git.kernel.org/stable/c/b64f60c468d149aca22ea56bb842b9730215aaa5",
        "https://git.kernel.org/stable/c/c312b750bb5ac3348cfc85dab25e90937bd4d251",
        "https://git.kernel.org/stable/c/c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72117.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72117",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72117.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72117",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 514367,
  "published_at": "2026-08-15T05:52:56.991+00:00"
}